" lnsular region (fields 13 and 14). We have adhered to the cytologic convention of Brodmann ('09) whereby the insular region is coextensive with the claustrum along the rhinal fissure. " "Area 13, thus de- fined, extends from the rostral piriform region, where the circular and rhinal fis- sures are confluent, caudally along the superior margin of the rhinal fissure to the posterior amygdaloid region. There, paleocortical fields 51 and 28 (Brodmann, '09; Krieg, '46a,b) are continuous with each other below the rhinal fissure. At this transition the claustrum merges with deep- er cellular layers of field 28, and field 13 is continuous with retrohippocampal field 35. The rostral limit of 13, thus defined, is identical to that in Krieg's map; the caudal limit lies caudal to that of Krieg. "
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